cbs reporter danielle nottingham is at reagan national airport. danielle. >> reporter: liz, airlines are still trying to catch up at this hour. today is considered one of the busiest days to fly during the holiday season. and airports all the way from texas to new york have struggled to move travelers along today. mobile, alabama is still cleaning up a day after storm ripped roofs from homes and shattered car windows. the porch at this home was destroyed. 34 tornadoes hit the southeast, the most ever in the u.s. on christmas day. years of drought in texas made the dry trees vulnerable to high winds. in arkansas, more than a foot of snow made for a rare day of sledding. more than 200,000 people have no power in the south. as the storm heads east, heavy rain is flooding parts of south carolina, blowing snow causing white-out conditions in indiana and ohio. and blizzard warnings are posted as far north as maine. this storm is wrecking travel plans. more than 900 flights have been canceled across the u.s., with more expected in the next couple of days